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Van der Waals interactions and the limits of isolated atom models at interfaces

Van der Waals forces are among the weakest, yet most decisive interactions governing condensation and aggregation processes and the phase behaviour of atomic and molecular matter. Understanding the resulting structural motifs and patterns has become increasingly important in studies of the nanoscale...

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Autores principales: Kawai, Shigeki, Foster, Adam S., Björkman, Torbjörn, Nowakowska, Sylwia, Björk, Jonas, Canova, Filippo Federici, Gade, Lutz H., Jung, Thomas A., Meyer, Ernst
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4869171/
https://www.ncbi.nlm.nih.gov/pubmed/27174162
http://dx.doi.org/10.1038/ncomms11559
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author Kawai, Shigeki
Foster, Adam S.
Björkman, Torbjörn
Nowakowska, Sylwia
Björk, Jonas
Canova, Filippo Federici
Gade, Lutz H.
Jung, Thomas A.
Meyer, Ernst
author_facet Kawai, Shigeki
Foster, Adam S.
Björkman, Torbjörn
Nowakowska, Sylwia
Björk, Jonas
Canova, Filippo Federici
Gade, Lutz H.
Jung, Thomas A.
Meyer, Ernst
author_sort Kawai, Shigeki
collection PubMed
description Van der Waals forces are among the weakest, yet most decisive interactions governing condensation and aggregation processes and the phase behaviour of atomic and molecular matter. Understanding the resulting structural motifs and patterns has become increasingly important in studies of the nanoscale regime. Here we measure the paradigmatic van der Waals interactions represented by the noble gas atom pairs Ar–Xe, Kr–Xe and Xe–Xe with a Xe-functionalized tip of an atomic force microscope at low temperature. Individual rare gas atoms were fixed at node sites of a surface-confined two-dimensional metal–organic framework. We found that the magnitude of the measured force increased with the atomic radius, yet detailed simulation by density functional theory revealed that the adsorption induced charge redistribution strengthened the van der Waals forces by a factor of up to two, thus demonstrating the limits of a purely atomic description of the interaction in these representative systems.
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spelling pubmed-48691712016-05-26 Van der Waals interactions and the limits of isolated atom models at interfaces Kawai, Shigeki Foster, Adam S. Björkman, Torbjörn Nowakowska, Sylwia Björk, Jonas Canova, Filippo Federici Gade, Lutz H. Jung, Thomas A. Meyer, Ernst Nat Commun Article Van der Waals forces are among the weakest, yet most decisive interactions governing condensation and aggregation processes and the phase behaviour of atomic and molecular matter. Understanding the resulting structural motifs and patterns has become increasingly important in studies of the nanoscale regime. Here we measure the paradigmatic van der Waals interactions represented by the noble gas atom pairs Ar–Xe, Kr–Xe and Xe–Xe with a Xe-functionalized tip of an atomic force microscope at low temperature. Individual rare gas atoms were fixed at node sites of a surface-confined two-dimensional metal–organic framework. We found that the magnitude of the measured force increased with the atomic radius, yet detailed simulation by density functional theory revealed that the adsorption induced charge redistribution strengthened the van der Waals forces by a factor of up to two, thus demonstrating the limits of a purely atomic description of the interaction in these representative systems. Nature Publishing Group 2016-05-13 /pmc/articles/PMC4869171/ /pubmed/27174162 http://dx.doi.org/10.1038/ncomms11559 Text en Copyright © 2016, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Kawai, Shigeki
Foster, Adam S.
Björkman, Torbjörn
Nowakowska, Sylwia
Björk, Jonas
Canova, Filippo Federici
Gade, Lutz H.
Jung, Thomas A.
Meyer, Ernst
Van der Waals interactions and the limits of isolated atom models at interfaces
title Van der Waals interactions and the limits of isolated atom models at interfaces
title_full Van der Waals interactions and the limits of isolated atom models at interfaces
title_fullStr Van der Waals interactions and the limits of isolated atom models at interfaces
title_full_unstemmed Van der Waals interactions and the limits of isolated atom models at interfaces
title_short Van der Waals interactions and the limits of isolated atom models at interfaces
title_sort van der waals interactions and the limits of isolated atom models at interfaces
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4869171/
https://www.ncbi.nlm.nih.gov/pubmed/27174162
http://dx.doi.org/10.1038/ncomms11559
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